Staff Publications

Staff Publications

  • external user (warningwarning)
  • Log in as
  • language uk
  • About

    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

    Records 1 - 20 / 61

    • help
    • print

      Print search results

    • export

      Export search results

    Check title to add to marked list
    User manual for FOCUSSPIN version 3.3
    Kraalingen, D. van; Berg, F. van den; Wipfler, E.L. ; Beltman, W.H.J. ; Horst, M.M.S. ter; Roller, J.A. te - \ 2020
    Wageningen : Statutory Research Tasks Unit for Nature & the Environment (WOt-technical report 169) - 38
    In the EU and Dutch national registration procedures for plant protection products, fate models and scenarios are being used to assess the environmental risks of these products. For each model application, data on the physico-chemical properties of the substances are required. The software tool SPIN has been developed to store substance properties in a common database that can be accessed by the different model applications. This facilitates the use of these model applications for a specific substance. This user manual describes the use of FOCUSSPIN version 3.3, that can be used in combination with the EU FOCUS models (leaching to groundwater and exposure in surface water). FOCUSSPIN version 3.3. can also be used in combination with the new versions of national exposure assessment tools GeoPEARL (leaching to groundwater), DROPLET (drinking water) as well as the current version of GEM 3.3.2 (emission from greenhouses).
    Crop related aspects of crop canopy spray interception and spray drift from downward directed spray applications in field crops
    Zande, J.C. van de; Horst, M.M.S. ter - \ 2019
    Wageningen : Stichting Wageningen Research, Wageningen Plant Research, Business Unit Agrosystems Research (Report / Stichting Wageningen Research, Wageningen Plant Research, Business Unit Agrosystems Research WPR-420) - 113
    When spraying Plant Protection Products (PPPs), spray drift and crop interception are two important factors which influence the exposure of aquatic organisms in surface water to PPP. This exposure occurs either in a direct way via deposition of spray droplets on the surface water through spray drift or in an indirect way via the exposure of the soil underneath plants followed by transport of PPP to the surface water by drainage and/or runoff. Edge of field scenarios for the exposure of aquatic organisms in surface water were developed for downward directed spray applications in field crops. A software tool, DRAINBOW, is being developed to facilitate the calculations needed to assess the exposure of aquatic organisms in surface water. Authorisation is given based on the PPP label, which specifies among others the dose, the application technique (e.g. spraying, seed treatment), timing and frequency of the application and possible mitigation measures (e.g. spray drift reducing technologies, width of a crop-free buffer zone). Because spray drift and crop interception depend on the information specified on the label it is necessary to link all these parameters carefully. This report describes the data and the methods used in the DRAINBOW tool to link spray drift and crop interception to the information on the PPP label for downward directed spray applications. Spray drift deposition on surface water is shown to be different depending on spray drift reducing technology class (DRT), crop dependent last nozzle position, width of the crop-free buffer zone, crop growth stage and position and width of the surface water.
    Implementation of guidance on dossier evaluation for the registration of pest control products in Kenya
    Horst, Mechteld ter; Akinyi Aluoch, June ; Wanyonyi Barasa, Maurice ; Bosman-Hoefakker, Saskia ; Broeders, Jessica ; Etten, Jacobijn van; Jong, Esther de; Ngaruiya, Paul N. ; Steenbergh, Anne ; Valk, Harold van der; Wagate, Githaiga ; Muthoni Wambugu, Sarah ; Nekoye Waswa, Maureen ; Wipfler, Louise - \ 2019
    Wageningen : Wageningen Environmental Research (Wageningen Environmental Research report 2980) - ISBN 9789463952613 - 37
    This document describes suggestions for further steps that can be taken with regard to the evaluation of pest control products in Kenya. The document should be read together with the document describing proposed guidance on dossier evaluation for the registration of pest control products in Kenya and as such both contribute to a future complete pesticide evaluation manual for Kenya.Both documents were developed within the Pesticide management initiative East African Region: Kenya (PEAR -Kenya) project. The project ran in the period 2016 – 2019 and was sponsored and supported by the Dutch Ministry of Agriculture, Nature and Food Quality and the Embassy of the Netherlands in Nairobi.This document is intended to feed into discussions on further development of a complete pesticide evaluation manual for Kenya using the guidance mentioned as a starting point. Reflections on some of the methods proposed and also information on what is needed to implement the guidance developed in the project are provided. Additionally, suggestions for developing a framework for the risk assessment of aquatic organisms are given.
    Guidance on dossier evaluation for the registration of pest control products in Kenya
    Horst, Mechteld ter; Akinyi Aluoch, June ; Wanyonyi Barasa, Maurice ; Bosman-Hoefakker, Saskia ; Broeders, Jessica ; Etten, Jacobijn van; Jong, Esther de; Ngaruiya, Paul N. ; Steenbergh, Anne ; Valk, Harold van der; Wagate, Githaiga ; Muthoni Wambugu, Sarah ; Nekoye Waswa, Maureen ; Wipfler, Louise - \ 2019
    Wageningen : Wageningen Environmental Research (Wageningen Environmental Research report 2979) - ISBN 9789463952606 - 93
    This document describes guidance on dossier evaluation for the registration of pest control products in Kenya. The document provides guidance for the assessment of a limited number of aspects that are part of evaluation of a pest control product registration dossier. It should therefore not be considered as a complete pesticide evaluation manual, though it is intended to contribute to a future complete pest control product evaluation manual for Kenya. The guidance should be read together with an im plementation report which contains stepping stones for further development.The guidance was developed within the Pesticide management initiative East African Region: Kenya (PEAR -Kenya) project. The project ran in the period 2016 – 2019 and was sponsored and supported by the Dutch Ministry of Agriculture, Nature and Food Quality and the Embassy of the Netherlands in Nairobi.The guidance addresses various aspects of a pest control product evaluation covering low risk pest control products, microbial pest control product, chemical pest control products and equivalence determination. The evaluation procedures developed covers a fast-track pathway for low risk products. For microbial products the procedure focusses on identification, human pathology and infectiveness and hazard and risk assessments for metabolites of potential concern. For chemical products the procedure includes methods for human health and pollinator risk assessments. The evaluation process of new pest control products can be speeded up if the active ingredient or active agent of a new product proves to be equivalent to an already registered product.
    Modelinstrumentarium toelating Gewasbeschermingsmiddelen -TOXSWA model version 3.3. : Tussenrapportage WOT-04-008-024
    Horst, M.M.S. ter; Beltman, W.H.J. ; Adriaanse, P.I. ; Berg, F. van den - \ 2019
    Use of models for the environmental risk assessment of veterinary medicines in European aquaculture: Current situation and future perspectives
    Rico, Andreu ; Vighi, Marco ; Brink, Paul J. van den; Horst, Mechteld ter; Macken, Ailbhe ; Lillicrap, Adam ; Falconer, Lynne ; Telfer, Trevor C. - \ 2019
    Reviews in Aquaculture 11 (2019)4. - ISSN 1753-5123 - p. 969 - 988.
    Antimicrobials - Antiparasitics - Aquaculture - Environmental models - Environmental risk assessment

    Veterinary Medicinal Products (VMPs) are used in intensive aquaculture production to treat a wide range of bacterial and parasitic infestations. Their release into the environment poses concerns regarding their potential ecotoxicological risks to aquatic ecosystems, which need to be evaluated making use of appropriate Environmental Risk Assessment (ERA) schemes and models. This study presents an overview of the major aquaculture production systems in Europe, the VMPs most commonly used, and the environmental quality standards and regulatory procedures available for their ERA. Furthermore, it describes the state-of-the-art on the development of environmental models capable of assessing the fate, exposure, ecotoxicological effects and risks of VMPs in aquaculture production systems, and discusses their level of development and implementation within European aquaculture. This study shows that the use of environmental models in regulatory ERA is somewhat limited in many European countries. Major efforts have been dedicated to assess the fate and exposure of antiparasitic compounds in salmonid cage systems, particularly in Scotland, while models and scenarios for assessing dispersal of antimicrobials, in general, and antiparasitic compounds in the Mediterranean as well as in Scandinavian regions are less available. On the other hand, the use of ecological models for assessing the effects and risks of VMPs is almost absent. Recommendations are provided to improve the chemical exposure and effect assessments and the ecological realism of the modelling outcomes, paying special attention to the protection goals set for the regulatory ERA of VMPs in Europe.

    Modelinstrumentarium toelating Gewasbeschermingsmiddelen (TOXSWA) (2018). Tussenrapportage WOT-04-008-024.
    Horst, M.M.S. ter; Beltman, W.H.J. ; Adriaanse, P.I. ; Berg, F. van den - \ 2018
    WOT Natuur & Milieu (WOt-interne notitie 232)
    Manual for FOCUS_TOXSWA v5.5.3 and for expert use of TOXSWA kernel v3.3 : user’s guide version 5
    Beltman, W.H.J. ; Horst, M.M.S. ter; Adriaanse, P.I. ; Jong, A. de - \ 2018
    Wageningen : Statutory Research Tasks Unit for Nature & the Environment (WOt-technical report 126) - 148
    The FOCUS_TOXSWA model calculates exposure concentrations of pesticides and their metabolites in watercourses and ponds, of the so-called FOCUS surface water scenarios. These concentrations are used in the pesticide registration procedure at EU level. The model concepts of TOXSWA are described briefly. The procedure for using the TOXSWA kernel (i.e. expert use) and related input files and output files are described. Concerning FOCUS_TOXSWA, the use of the graphical user interface to access the input and output is described. Input data are stored in a database. Pesticide entries resulting from drainage or runoff/erosion are accessed from separate files generated by FOCUS_MACRO and FOCUS_PRZM. Substance properties are accessed from the SPIN tool/database. Instructions for simulating a water-sediment study and a multi-year run are given.
    Pesticide management in Rwanda : analysis of the current pest control products administration and management system
    Wipfler, Louise ; Horst, Mechteld ter - \ 2018
    Wageningen : Wageningen Environmental Research (Wageningen Environmental Research report 2904) - 37
    This report describes the assessment of the current pest control products administration and management system in Rwanda. The assessment includes the aspects pesticide registration and evaluation, inspection and control and waste management. Roles, responsibilities and capacities of the public institutions involved are evaluated and current Rwandan legislations, regulations and procedures on pest control products are reviewed based on a series of consults and/or interviews with public and private institutions, actors and stakeholders in Rwanda. Finally, a set of observations and recommendations for improvement is provided based on the assessment.
    Scenarios for exposure of aquatic organisms to plant protection products in the Netherlands : Part 2: Sideways and upward spraying in Dutch fruit crops (interim report)
    Boesten, J.J.T.I. ; Holterman, H.J. ; Wipfler, L. ; Horst, M.M.S. ter; Zande, J.C. van de; Adriaanse, P.I. - \ 2018
    Wageningen : Wageningen Environmental Research (Wageningen Environmental Research report 2861) - 55
    A methodology is presented to assess the exposure of aquatic organisms resulting from pesticide applications by sideways and upward spraying in Dutch fruit crops. It is the intention that this methodology will be used in Dutch pesticide registration. The methodology is based on the principle that the endpoint concentration represents a 90th percentile of the statistical population of concentrations to be expected in ditches alongside fruit crops. Furthermore the methodology is founded on the principle that the user should be able to choose between different drift-reduction technology (DRT) classes and between different widths of the crop-free buffer zone. Spray drift is the only exposure route considered in the methodology. The 90th percentile concentration (PEC90) is based on a spatially distributed model that simulates the frequency distribution of the annual maximum concentration of more than 70,000 spatial units (i.e. ditches characterised by waterbody properties and their orientation with respect to the direction of the rows of the fruit trees and to the N-E-S-W direction) for 100 simulation years. This frequency distribution was calculated for different application patterns, different DRT classes and different widths of the crop-free buffer zone. Next, one of the 70,000 spatial units was selected which fulfilled the criterion that it could be used to calculate this PEC90 for all combinations of application patterns, DRT classes and widths by selecting a suitable percentile of its temporal distribution of concentrations. The TOXSWA model (coupled to the hydrological SWQN model simulating water depths and water flow rates) was parameterised for this selected spatial unit to run for 26 years. The first six years were used as a ‘warming-up’ period and the remaining 20 years for assessing the required temporal percentile. The scenario ditch was 300 m long of which only the 100 m in the middle received a drift load of pesticide. The direction of water flow may change on a daily basis and the water flowing into the 300-m ditch was assumed to be free of pesticide. The median residence time of a droplet of water in the 100-m ditch was about 1 day. The
    spray drift deposition for the 99% DRT class appeared to be as low as 0.03-
    0.07% for summer applications. At such low deposition levels the contribution of leaching from drain pipes and of atmospheric deposition may exceed that of the drift deposition.
    Risk reduction of pesticides in Myanmar : interim report of the Dutch-Myanmar project of pesticide registration and pesticide risk reduction 2016-2018
    Horst, Mechteld ter; Deneer, John ; Valk, Harold van der; Kyaw Oo, Aung ; San Lwin, San ; Raw, Sen ; Krook, Janhendrik - \ 2018
    Wageningen : Wageningen Environmental Research (Wageningen Environmental Research report 2879) - 143
    Ditch parameterisation for the aquatic exposure assessment of plant protection products in the Netherlands by sideways and upward spraying in fruit orchards
    Wipfler, Louise ; Horst, Mechteld ter; Massop, Harry ; Walvoort, Dennis - \ 2018
    Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2850) - 107
    Modelinstrumentarium Toelating Gewasbeschermingsmiddelen en Biociden (TOXSWA) : Tussenrapportage WOT-04-008-024
    Horst, M.M.S. ter; Beltman, W.H.J. ; Adriaanse, P.I. ; Berg, F. van den - \ 2017
    Wageningen : Wettelijke Onderzoekstaken Natuur & Milieu (WOt-interne notitie 187)
    Hydrolysis and biotic transformation in water in the pesticide model : Implementation report
    Horst, M.M.S. ter; Beltman, W.H.J. ; Adriaanse, P.I. ; Mulder, H.M. - \ 2017
    Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2848) - 55
    The TOXSWA model has been extended with the functionality to simulate hydrolysis and biotic transformation in water. TOXSWA simulates the fate of pesticides in water bodies to calculate exposure calculations for aquatic organisms or sediment-dwelling organisms as part of the aquatic risk assessment of pesticides. Hydrolysis and biotic transformation are modelled as first-order processes, occuring in the water phase only. The hydrolysis transformation rates are considered to be dependent on both pH and temperature. The biotic transformation rate is considered to be temperature-dependent only.
    Analyzing the limitations and the applicability domain of water-sediment transformation tests like OECD 308
    Horst, Mechteld ter; Koelmans, A.A. - \ 2016
    Environmental Science and Technology 50 (2016)19. - ISSN 0013-936X - p. 10335 - 10342.
    The assessment of chemical degradation rates from water-sediment experiments like for instance OECD 308 is challenging due to parallel occurrence of processes like degradation, sorption and diffusive transport, at different rates in water and sediment or at their interface. To systematically and quantitatively analyse this limitation, we generated artificial experiment datasets using model simulations and then used these datasets in an inverse modelling exercise to estimate degradation half-lives in water and sediment (DegT50wat and DegT50sed), which then were evaluated against their true values. Results were visualised by chemical space diagrams that identified those substance property combinations for which the OECD 308 test is fundamentally inappropriate. We show that the uncertainty in estimated degradation half-lives in water increases as the process of diffusion to the sediment becomes dominant over degradation in the water. We show that in theory the uncertainty in the estimated DegT50sed is smaller than the uncertainty in the DegT50wat. The predictive value of our chemical space diagrams was validated using literature transformation rates and their uncertainties that were inferred from real water-sediment experiments.
    The TOXSWA model version 3.3 for pesticide behaviour in small surface waters : description of processes
    Horst, M.M.S. ter; Beltman, W.H.J. ; Berg, F. van den - \ 2016
    Wageningen : Statutory Research Tasks Unit for Nature & the Environment (WOt-technical report 84) - 72
    pesticides - surface water - models - modeling - aquatic ecosystems - drainage - runoff - pesticiden - oppervlaktewater - modellen - modelleren - aquatische ecosystemen - drainage - oppervlakkige afvoer
    In the European Union (EU) the risk of plant protection products to aquatic organisms is assessed accordingto regulation 1107/2009. For this assessment the FOCUS Surface Water Scenarios have been developed. TheTOXSWA model is included in the FOCUS Surface Water Software tools to calculate the exposureconcentration in the water systems defined in those scenarios. At the national level the TOXSWA model isused to assess the exposure concentration in the water system defined in national scenarios. In this report adescription is given of the hydrology in the Dutch and EU water body systems and the fate of pesticides andtheir metabolites in water and sediment. The pesticide can enter the system by spray drift and/or drainageand run-off. The transport in the water system is described by advection, dispersion and diffusion. Theexchange at the water-sediment interface is described based on advection/diffusion. Other processes aresorption, volatilisation at the water – air interface and transformation in both the water layer and thesediment. The formation and transformation of metabolites in both compartments are described. The reportpresents an outlook on the improvements in the next version as well as on future developments.
    Towards a model- and landscape-based regulatory aquatic risk assessment of pesticides: state-of-the-art and recommendations for improving fate and effect models
    Focks, A. ; Horst, M.M.S. ter; Adriaanse, P.I. ; Berg, F. van den; Boesten, J.J.T.I. ; Rico Artero, A. ; Baveco, J.M. ; Brink, P.J. van den; Wipfler, E.L. - \ 2016
    Risk assessment of pesticides used in rice-prawn concurrent systems in Bangladesh
    Sumon, Kizar Ahmed ; Rico, Andreu ; Horst, Mechteld M.S. Ter; Brink, Paul J. Van den; Haque, Mohammad Mahfujul ; Rashid, Harunur - \ 2016
    Science of the Total Environment 568 (2016). - ISSN 0048-9697 - p. 498 - 506.
    Environmental risk assessment - Macrobrachium rosenbergii - Occupational health hazards - PERPEST - Pesticides - TOXSWA

    The objectives of the current study were to determine the occupational health hazards posed by the application of pesticides in rice-prawn concurrent systems of south-west Bangladesh and to assess their potential risks for the aquatic ecosystems that support the culture of freshwater prawns (Macrobrachium rosenbergii). Information on pesticide use in rice-prawn farming was collected through structured interviews with 38 farm owners held between January and May of 2012. The risks of the pesticide use to human health were assessed through structured interviews. The TOXSWA model was used to calculate pesticide exposure (peak and time-weighted average concentrations) in surface waters of rice-prawn systems for different spray drift scenarios and a simple first tier risk assessment based on threshold concentrations derived from single species toxicity tests were used to assess the ecological risk in the form of risk quotients. The PERPEST model was used to refine the ecological risks when the first tier assessment indicated a possible risk. Eleven synthetic insecticides and one fungicide (sulphur) were recorded as part of this investigation. The most commonly reported pesticide was sulphur (used by 29% of the interviewed farmers), followed by thiamethoxam, chlorantraniliprole, and phenthoate (21%). A large portion of the interviewed farmers described negative health symptoms after pesticide applications, including vomiting (51%), headache (18%) and eye irritation (12%). The results of the first tier risk assessment indicated that chlorpyrifos, cypermethrin, alpha-cypermethrin, and malathion may pose a high to moderate acute and chronic risks for invertebrates and fish in all evaluated spray drift scenarios. The higher tier assessment using the PERPEST model confirmed the high risk of cypermethrin, alpha-cypermethrin, and chlorpyrifos for insects and macro- and micro-crustaceans thus indicating that these pesticides may have severe adverse consequences for the prawn production yields.

    Impact of bioturbation on pesticide exposure of benthic organisms: a modelling approach
    Bergstedt, Helena ; Wipfler, E.L. ; Beltman, W.H.J. ; Baveco, J.M. ; Adriaanse, P.I. ; Horst, M.M.S. ter - \ 2015
    In: XV Symposium in pesticide chemistry : environmental risk assessment and management. - Fidenza : Mattioli 1885 - ISBN 9788862615082 - p. 97 - 97.
    Surface water risk assessment of pesticides in Ethiopia
    Teklu, B.M. ; Adriaanse, P.I. ; Horst, M.M.S. ter; Deneer, J.W. ; Brink, P.J. van den - \ 2015
    Check title to add to marked list
    << previous | next >>

    Show 20 50 100 records per page

     
    Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.